Improvement in dogs for saw-mill head-blocks



D. K. NonTuN. Dogs for saw-Mill Head-Blocks.

Patented June 21874.

N0.151,61ss.

UNITED STATES PATENT OFFICE,

DURENE K. NORTON, OF CINCINNATI, OHIO.

IMPROVEMENT IN DOGS FOR SAW-MILL HEAD-BLOCKS.

Specification forming part of Letters Patent No. 151,613, dated June 2, 1874; application filed May 1, 1R74.

and connecting the hinged dog with elevating and depressing devices, also of peculiar construction, that the dog is permitted to assume various angles in securing the log, and at the same time to preserve a connection free from slacking or play with the devices that elevate and depress it.

Figure 1 is a perspective view of a portion of a head-block with its knee and dog. Fig. 2 is a vertical section through the knee and dog.

A is the knee of the head-block B. This knee has a socket, a, formed upon it, for the reception of the round shank c of the dog-post C, the shank having a circular groove, into which a set-screw, D, in the socket tits, the set-screw, while permitting the swiveling of the dog-post, serving to prevent its withdrawal. The dog-post has an angular box, C', formed upon it, to the outer end of which the dog E is pivoted, as shown. Vithin the dog-post a slide, F, is fitted, to move vertically, between the V-shapcd jaws of which the dog- E is 1ocated. This slide is elevated and depressed by the screw G, which has a swivcling connection with the top of the slide, as shown. The upper V ofthe slide has a continuous contact with the upper edge of the dog, and the pressure of the screw upon this upper V serves to force the dog` into the log, in the manner shown in Fig. l. The width between the V- shaped jaws ofthe slide F is suicient to allow ofthe full range of angularity necessary for .the dog; and in order to prevent shackling between the jaws of thel slide in moving the dog, I provide, at the bottom of the slide F, a spring, H, which serves tO force a pin, I, forcibly against the lower edge Ot the dog` E, and thus keep said dog iirmly against the upper jaw of the slide while the dog is being` raised.

I claim- In combination with the post C, hinged dog E, and Operating-screw G, the slide F, tted with spring` H and bolt I, the parts beingl connected and operating substantially in the manner and for the purpose specified.

In testimony of which invention I hereunto Set my 11a-nd.

Vitncsses: DURENE K. NORTON.

JEROME DU Bois,

HUNTER. 

